Needle-cam structure for knitting-machines



R. w. SCOTT.

NEEDLE CAM STRUCTURE FOR KNHTING MACHINES.

APPLICATION FILED 0CT.22, 1914.

1,311,093. Patented July 22, 1919.

Tlln coLuMmA PLANOGRAPII CO-. WASHINGTON, n. c.

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ROBERT w. soo'rr, OF Bosron; MAssaoH sETrs, ASSIGNOR, BY MESNE ASSIG MENTS, 'ro soorr & WILLIAMS; mcoaroaa'rnn, A CORPORATION or MASSACHUSETTS.

NEEDLE-CAM STRUCTURE FOR KNITTING-MACHINES.

Specification areas-S Patent.

Patented July 22, 1919.

Application filed October 22, 1914. Serial No. 868,109.

To all whom it may concern:

Be it known that I, RoBERrW. Scorr, citizen of the United States, and resident of Boston, in the county of-Sufl'olk'and State of Massachusetts, have invented certain new and useful Improvements in Needle-Cam Structures for Knitting-l/lachines, of which the following is a specification.

My invention relates to needle cams such as those employed in circular knitting machines having independently movableneedles.

One object of my invention is to provide a cam structure of this nature which can be made accurately of the desired form, with economy of manufacture.

In the accompanying drawings Figure 1 is a plan view of a cam-carrier segment carrying two of my improved cams;

Fig. 2 is a perspective partly in section illustrating the new structure;

Fig. 3 is a perspective view of a blank from which one of such cams is formed;

Fig. 4 is a view showing the said cam in a completed state, and

Fig. 5 is a perspective view of the exterior face of the cam showing {one form of the metal spacer attached to the cam.

Such cams for circular knitting machines, as heretofore constructed, comprise comparatively thick curved bodies held by screws within a mounting or cam ring, such as that of which part 370, Fig. 1, is a segment, one or more edges of the cam being milled and ground to conform to the desired surface to actuate needle butts held in an adjacent needle carrier.

Such cams are usually milled, punched or otherwise roughly cut from fiat sheet or bar metal, then bent to conform to their carrier;

and thereafter milled or ground at their blank, which is afterward bent, by formingdies or otherwise, to the required cylindrical form. As shown in Fig. 4:, elements of the edge surfaces such as lines 00, y and a, and the axes of the screw holes 9 are, by reason of the relative thinness of the blank, brought with sufiicient accuracy to the desired radial directions without further shaping, although I may smooth and finish the working surfaces if desired.

Cams so formed are fixedly but adj ustably mounted at an operative distance within thelr carrier ring or segment such as 370 by means of the screws 10 and spacers or filling pieces 3, preferably of soft material such as brass or Babbitt metal, which spacers may each conform to the general shape of its cam, such as 6 or 7 but are each smaller in at least one dimension, to cause the working edge of the cam to project, as at 12, from the edge of the spacer, to prevent the spacer from touching the needle butt.

The spacers 3 may be formed by punching or cutting from fiat sheets, and may be left fiat to be bent to place during assembly. In some cases, the machined or finished steel cam, Fig. 4, may have cast upon it its spacer 3, consisting of any suitable soft metal, such as lead or any mixture of lead and a harder metal, astin or antimony.

In use with needles having butts of different lengths, such as a and 92 Fig. 1, my improved cams, which may be substantially as thick as the free projection of the shorter needle butts, are subjected all over their working surfaces to the same degree of wear from all lengths of needle-butts.

What I claim is 1. In a cam device for knitting machines a needle cam structure comprising a carrier segment of a cylinder, a stitchcam and a spacer between said segment and stitch cam having an edge offset within an operative edge of said stitch cam, whereby said spacer is out of contact with the needle butts operated by said cam and means for binding together segment, spacer and cam to fixedly position the cam.

2. As an article of manufacture for use in knitting machines, a knitting cam having a spacer attached thereto and offset within an edge thereof.

3. Asan article of manufacture for use in knitting machines, a cam made as a shaped segment of a cylinder having attached to its name to this specification in the presence of outerqsurface cast metal spacer. h tW-o subscribing witnesses.

at. he coin ination in a knittin mac ine 1 of a can'i-carrier, a relatively ha-Fcl need'le- ROBERT SCOTT cam, and a soft metal spacer between said Witnesses: element's-east inadherence to one of them. 7.11. HAGERTX,

In testimony whereof, I have signed my M. W. MGKAY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. \O. 

